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Postcranial Morphology and the Locomotor Adaptations of Extant and Extinct Crocodylomorphs and Lepidosaurs Laura Rooney East Tennessee State University

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Postcranial Morphology and the Locomotor Adaptations of Extant and Extinct Crocodylomorphs and Lepidosaurs Laura Rooney East Tennessee State University East Tennessee State University Digital Commons @ East Tennessee State University Electronic Theses and Dissertations Student Works 5-2018 Postcranial Morphology and the Locomotor Adaptations of Extant and Extinct Crocodylomorphs and Lepidosaurs Laura Rooney East Tennessee State University Follow this and additional works at: https://dc.etsu.edu/etd Part of the Paleobiology Commons, and the Paleontology Commons Recommended Citation Rooney, Laura, "Postcranial Morphology and the Locomotor Adaptations of Extant and Extinct Crocodylomorphs and Lepidosaurs" (2018). Electronic Theses and Dissertations. Paper 3418. https://dc.etsu.edu/etd/3418 This Thesis - Open Access is brought to you for free and open access by the Student Works at Digital Commons @ East Tennessee State University. It has been accepted for inclusion in Electronic Theses and Dissertations by an authorized administrator of Digital Commons @ East Tennessee State University. For more information, please contact [email protected]. Postcranial Morphology and the Locomotor Adaptations of Extant and Extinct Crocodylomorphs and Lepidosaurs A thesis presented to the faculty of the Department of Geosciences East Tennessee State University In partial fulfillment of the requirements for the degree Master of Science in Geosciences by Laura Rooney May 2018 Joshua Samuels, Chair Blaine Schubert Chris Widga Keywords: Lepidosaur, Crocodylomorph, Morphology, Locomotion, Crocodilian ABSTRACT Postcranial Morphology and the Locomotor Adaptations of Extant and Extinct Crocodylomorphs and Lepidosaurs by Laura Rooney I have collected a series of linear measurements of the postcranial skeletons of 43 extant crocodylian and lepidosaur taxa to determine if those engaging in similar locomotor behavior display similar morphology despite phylogenetic differences. Stepwise discriminant function analyses reveal reptile locomotor mode can be accurately predicted (over 80% correct) based on morphology. Semi-aquatic taxa are distinguished by a longer ischium relative to pubis length, a longer scapula relative to humerus length, and a broader acetabulum than terrestrial and arboreal taxa. Arboreal taxa display a more elongate, gracile humerus and a smaller acetabulum. This morphometric data can potentially be used to predict the locomotor behavior of a wide range of extinct reptile taxa. Within this study, Hyposaurus rogersii, Necrosuchus ionensis, Alligator sp. of the Gray Fossil Site, Crocodylus affinis, and Allognathosuchus mooki were examined and all were inferred to be semi-aquatic by the discriminant function analysis. 2 TABLE OF CONTENTS ABSTRACT ........................................................................................................................................ 2 LIST OF TABLES ................................................................................................................................ 3 LIST OF FIGURES .............................................................................................................................. 5 Chapter 1. INTRODUCTION ........................................................................................................................... 6 2. BACKGROUND ............................................................................................................................. 7 Evolution of Crocodylomorph and Lepidosaur Locomotion ....................................................... 7 Locomotor Diversity of Crocodylomorphs and Lepidosaurs .................................................. 7 Past Studies Inferring Locomotion of Extinct Crocodylomorphs ............................................ 8 Skeletal Morphology Reflects Functional Performance ............................................................. 9 Quantitative Methods of Utilizing Postcrania to Infer Locomotion ......................................... 10 Past Studies Inferring Locomotion in Mammals ................................................................... 10 Linking Postcranial Morphology to Locomotor Behavior in Reptiles ................................... 11 Complications When Examining Reptiles vs. Mammals ....................................................... 11 3. METHODS .................................................................................................................................. 13 Crocodylian and Lepidosaur Taxa ............................................................................................. 13 Postcranial Measurements ....................................................................................................... 15 Statistical Analyses .................................................................................................................... 20 4. RESULTS ..................................................................................................................................... 22 ANOVA Results .......................................................................................................................... 22 DFA Using Osteological Indices (Indices DFA) ........................................................................... 23 DFA Using Geometric Mean Transformed Variables (GM DFA) ............................................... 25 Inferred Locomotor Modes of Extant Lepidosaur and Crocodylian Taxa ................................. 27 Linear Regressions and Interspecific Allometry ........................................................................ 30 Inferred Locomotor Modes of Extinct Crocodylians ................................................................. 37 5. DISCUSSION ............................................................................................................................... 39 Correlation of Postcranial Morphology with Locomotor Mode in Extant Crocodylians and Lepidosaurs ............................................................................................................................... 39 Assessment of Convergence in Lepidosaurs and Crocodylians ................................................ 42 Applications for Analyzing Locomotor Diversity of Extinct Reptiles ......................................... 48 6. CONCLUSIONS ........................................................................................................................... 51 REFERENCES .................................................................................................................................. 52 VITA ............................................................................................................................................... 57 3 LIST OF TABLES Table Page 1. List of extant species included in analysis................................................................................ 13 2. Locomotor categories used in the analyses and their definitions ........................................... 15 3. Extinct crocodylomorph taxa ................................................................................................... 15 4. Postcranial measurements used in the analyses ..................................................................... 16 5. Osteological indices used in the Indices DFA ........................................................................... 18 6. Mean values and standard deviations of indices for each locomotor group .......................... 22 7. Indices DFA structure matrix and summary statistics ............................................................. 24 8. GM DFA structure matrix and summary statistics ................................................................... 26 9. Indices DFA classification matrix .............................................................................................. 28 10. Indices DFA misclassified cases .............................................................................................. 29 11. GM DFA classification matrix ................................................................................................. 30 12. GM DFA misclassified cases ................................................................................................... 30 13. Z-scores displaying the influence of allometry on variables identified by the DFAs ............. 33 14. Indices DFA classification of extinct species .......................................................................... 37 15. Z-scores displaying the influence of allometry on different locomotor groups .................... 46 4 LIST OF FIGURES Figure Page 1. Measurements of the axial and appendicular skeleton used in this study ............................. 17 2. Boxplots of functional indices .................................................................................................. 23 3. Plot of DF1 and DF2 scores for extant reptile taxa analyzed in the Indices DFA ..................... 25 4. Plot of DF1 and DF2 scores for extant reptile taxa analyzed in the GM DFA .......................... 27 5. Plots of selected functional indices and GM transformed variables versus the log geometric mean (a proxy for body size). ................................................................................................... 33 6. Log/log plots of variable components that displayed significance within the Indices DFA and the GM DFA .............................................................................................................................. 35 7. Log/log plots of indices components ......................................................................................
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